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Gelly vs Nocturne: catalog facts
Gelly	Nocturne
Free Free and open source under the GPL-3.0-or-later.	Free Free and open source under the GPL-3.0-or-later.
Linux, Command line	Linux
Supports both Jellyfin and Subsonic servers Gapless playback and ReplayGain	Automatic synced lyrics Caching keeps large libraries responsive
Needs your own Jellyfin or Subsonic-compatible server Linux only	Built around Navidrome as the library backend Linux only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
Account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.